linux-kernel - Re: dmaengine: dw-dmac: Custom cyclic API (Why?)

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Message-ID: <391eddb5-6ff5-6ae2-f224-ba9f00e19f69@synopsys.com>
Date:   Mon, 2 Jan 2017 13:56:38 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Vinod Koul <vinod.koul@...el.com>
CC:     Jose Abreu <Jose.Abreu@...opsys.com>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        <vireshk@...nel.org>
Subject: Re: dmaengine: dw-dmac: Custom cyclic API (Why?)

Hi,


On 02-01-2017 11:30, Andy Shevchenko wrote:
> On Mon, 2017-01-02 at 15:48 +0530, Vinod Koul wrote:
>> On Mon, Jan 02, 2017 at 10:38:00AM +0200, Andy Shevchenko wrote:
>>> On Fri, 2016-12-30 at 12:05 +0000, Jose Abreu wrote:
>>>> ++dw-dmac Maintainers
>>> I used to have some semi-finished patch to switch to generic API,
>>> though
>>> at that point I had no means to test it.
>>>
>>> Since I eventually got iDMA 32-bit, which is used as LPE Audio DMA
>>> engine, support in my branch I might test it in the future, though I
>>> think someone else would be much faster than me.
>> no we can't, since the DSP is involved and takes control, so unless we
>> do
>> lots of nasty hacks, it won't be testable. I don't see the ROI for
>> such an
>> effort.
> Thanks for clarification
>
>> btw, feel free to test and send patches if you have such a h/w
> Actually we have AVR32 connected to our lab. So, I can test it there,
> but I rather need a patch to use some dummy stub instead of codec (it
> has no codec connected).
>

Thank you all for the info. I don't have the HW ready to test yet
(I was collecting some info first), but when I do I can test on
my side using Designware I2S and ALSA SoC DMA engine.

Best regards,
Jose Miguel Abreu